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EGSA Set 01 – Basic Electricity – Electrical
Fundamentals – study material
A three phase electric generator has coils which are wound with how many degrees of separation? a) 6 degrees b) 120 degrees c) 60 degrees d) 150 degrees - correct answer ✔✔b) 120 degrees Wattage is the measurement of: a) Power b) Current c) Potential d) Inductance - correct answer ✔✔a) Power An AC sine wave has which of the following characteristics? a) Peak to Peak Amplitude. b) A Root Means Squared value. c) A corresponding current sine wave. d) All of the above. - correct answer ✔✔D) All of the above. The difference between alternating and direct current is that AC is:
a) Bi-directional b) Always constant c) Safer d) Faster - correct answer ✔✔A) Bi-directional. Reactive power in an AC circuit is termed: a) W b) VA c) VAR d) Capacitive Load - correct answer ✔✔c) VAR Which of the following determines total power in a series circuit? a) Source voltage times the current b) Total voltage applied to the circuit c) Current flowing through a switch d) Average of the wattage consumed by each resistor. - correct answer ✔✔a) Source voltage times the current The formula for calculating power factor in a three phase circuit is: a) Watts x 1.732 x Volts b) Watts / (Volts x Amps x 1.732) c) Volts/Amps x 1. d) Watts / (Volts x Amps x 1.414) - correct answer ✔✔b) Watts / (Volts x Amps x 1.732)
b) Length c) Insulation d) Temperature - correct answer ✔✔c) Insulation Voltage in an electrical system is calculated by the formula: a) E = P / I b) E = I * R c) E = square (P x R) d) All of the above - correct answer ✔✔d) All of the above What is the unit of measure for electrical pressure or electromotive force? a) amps b) ohm c) volts d) watts - correct answer ✔✔c) volts A parallet circuit configuration exhibits which of the following characteristics? a) Each component drops a different amount of voltage depending on its resistance. b) Each component has a different amount of current running through it unless all the resistive values are identical. c) The total resistance will always be larger than the largest individual resistance.
d) All of the above. - correct answer ✔✔b) Each component has a different amount of current running through it unless all the resistive values are identical. There are two resistors in a parallel circuit. One has the value of 15 ohms in the first branch, and the other is 4 ohm in the second branch. What is the total current if the supply voltage is 15volts? a) 3.15 A b) 4.74 A c) 11 A d) 15 A - correct answer ✔✔b) 4.74 A If a 100 ohm resistor suddenly became open in series circuit, what would happen to the current? a) It would become maximum value. b) It would become 0. c) It would stay the same. d) It would decrease only slightly. - correct answer ✔✔b) It would become 0. A 10 watt light bulb has 0.5 amps of current running through it. What is the voltage? a) 2v b) 5v c) 20v d) 50v - correct answer ✔✔c) 20v
d) Two voltmeters - correct answer ✔✔b) Phase rotation meter When testing a diode using DVOM in the diode test mode, what would indicate a good diode? a) Positive lead closest to the stripe, negative lead on the opposite end yields 0.5 volts. b) Negative lead closest to the stripe, positive lead on the opposite end yields 0.5 volts. c) Positive lead closest to the stripe, negative lead on the opposite end yields an open. d) B and C must both be true or the test is incomplete. - correct answer ✔✔d) B and C must both be true or the test is incomplete. In a 208 volt system, using a Clamp On Ammeter, you record A phase=57A, B phase=68A, and C phase=59A. If the power factor is .92, calculate KW. a) 20 KW b) 13 KW c) 60 KW d) 5 KW - correct answer ✔✔a) 20 KW Which of the following is the color code of phase wiring on a 480 volt, 3 phase system for ABC rotation? a) yellow, orange, brown b) red, white, blue c) black, red, blue d) brown, orange, yellow - correct answer ✔✔d) brown, orange, yellow
The following symbol is a ________ and the vertical line represents the _______. a) Resistor, value b) Transistor, base c) Diode, anode d) Diode, cathode -->I-- - correct answer ✔✔d) Diode, cathode Hold for Drawing - correct answer ✔✔Hold Which of the following wires has the greatest cross-sectional area? A. 0 AWG B. 00 AWG C. 4 AWG D. 20 AWG - correct answer ✔✔B. 00 AWG When referring to shielded cable, which is NOT a correct statement about terminating that shield? a) Terminate one end only b) Terminate to ground c) Terminate both ends to ground d) Shields should never be left un-terminated. - correct answer ✔✔c) Terminate both ends to ground. Which type of transformers must always be shunted prior to performing maintenance operations on them?
